All things related to internationalization (i18n) and localization (l10n):

Unicode and character encoding: (main topic: character encoding)

  • Cliconv - Cliconv is a simple FFI interface to the iconv library that lets Common Lisp programs translate byte sequences from/to different character encodings
  • creole - creole is a library for converting a string between multibyte and unicode character encodings
  • flexi-streams - FLEXI-STREAMS is a library which implements "virtual" bivalent streams that can be layered atop real binary/bivalent streams
  • iconv - iconv is a iconv(man 3 iconv) Library